The document discusses different strategies for testing software, including testing with mocks and fakes, as well as types of tests like unit, integration, contract and system tests. It also covers types of external dependencies applications may have like read/write to databases, and challenges of testing with external adapters like availability and speed issues.

1. Testing strategies
Software Craft Grenoble 20/09/2022

2. Test SUT
Stub
Spy
Test SUT Fake /
Simulator
Other
classes
Setup
Setup
Veri
fi
cation
Veri
fi
cation
Testing with mocks
Testing with fakes

3. Test SUT Fake /
Simulator
Other
classes
Setup
Veri
fi
cation
Domai
n
Interface
Read depencency

4. Test SUT Fake /
Simulator
Other
classes
Setup
Veri
fi
cation
Domai
n
Interface
Write depencency

5. Test SUT Fake /
Simulator
Other
classes
Setup
Veri
fi
cation
Read-Write depencency

6. Syste
m
test

7. Applicatio
n
test

8. Uni
t
test

9. Contract
Contrac
t
test

10. Test
Real
adapter
Simulator
Contract
=
running the same test
Domai
n
Interface
Including
anti-corruptio
n
layer
External
Service

11. Values of a test
• Protect against regressions
• Allow refactoring
• Allow changes
• Fast
• Deterministic
• Con
fi
dence
• Precise
• Documentation

12. Types of external
dependencies
Rea
d
- Registries
- Pdf extraction
- Weather
Writ
e
- Emailing
- Payments
- Job launching
Read - Writ
e
- Data stores
- Identity pools
- File systems

13. Annoyances with adapter
tests
• Availability
• Speed
• External changes? - and frequency
• Cost of call
• Accessible locally?